Steam-boiler



(Model.)

2 J. N. FARNHAM.

Steam-Boiler.

Patente'l y M ay 1 8., 1880;

Fig. .5.

N. PETERS. PHOTQ LTHDGRAPHER, WASHINGTON D C UNITED. STATES PATENT OFFICE.

JOHN N. EAENHAM, OE WALTHAM, MASSACHUSETTS.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 227,621, dated May 18, 1880. Application led March 1, 1880. (Model.)

To all whom it may concern:

Be it known that I, JOHN N. FARNHAi/r, of Waltham, of the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Steam-Boilers; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, Of Which- Figure 1 is-a longitudinal and vertical section, and Fig. 2 a transverse and vertical section, of a boiler provided with my invention. Fig. 3 is a horizontal section taken through the smoke-chamber, and Fig. 4 is a similar section taken through the tire-place and the smoke-discharge tubes about the sides and ends thereof.

In carrying out my invention I construct the boiler with a fire-place arranged within it, and over such fireplace I place, within the boiler, a smoke-chamber having at itsfront end a fuel-supplying opening. This smokechamberprojects laterally beyond the sides and yrear end of the tire-place, and has a series Of smokedischarge pipes or ducts leading out of it (the said chamber) and down through the Water-space, around the tire-place, and to and Opening through 'the bottom of the boilerinto a liuc-space around the ash-pit and underneath the boiler, and extending' up the sides and rear end and over the top of the boiler.

In a boiler so constructed the water tO be heated covers the smol;e-chamber, extends around the fire-place on its sides and rear end, or both ends of it, and encompasses the pipes through which the smoke escapes from the smoke-chamber. The water thereby becomes heated to great advantage. lt furthermore is heated by the smoke and volatile products of combustion that, passing out of the said pipes, course underneath the boiler and up against its sides and rear end, and over its top, from which they escape by a duct leading out of the flue-space over the boiler.

In the drawings, A denotes the boiler or its outer shell. B is the nre-place, which is wholly within the boiler, and is to have a grate at its lower part to open into an ash-pit, C, arranged. below the nre-place.

rIhe smoke-chamber is shown at D. It is Wholly Within the shell A, and projects beyond the fireplace at its sides and rear endv inmanner as represented, and there is led out of such smoke-chamber, at its bottom, a series Ot' discharge pipes or tubes, E, which go down alongside of the tire-place to the bottom of the boiler-shell, and Open through such into a flue, F, arranged underneath the shell and around the ash-pit and up the sides and end of the shell, and over its top, all as represente'd.

The water-space of the boiler is shown as arranged against the front end'as well as against the rear end and the sides of the fireplace', but instead ofhaving the waterspace across the front end of the fireplace in manner as shown at a, I sometimes have it only on the sides and rear end of the fire-place.

A fuel-supply. opening or throat, b, is made to lead from the front end Of the boiler into the smoke-chamber.

My improvement relates to what are termed horizontal boilers,77 the boiler hereinbefore described being of that character, and though analogous in. some particulars to the upright boilers shown and described in Patents Nos. 47,968 and 83,445, differs therefrom in important particulars, as its flue-space extends entirely over and around the arched top of such boiler, besides going up its sides and rear, and underneath it and around its ashpit, whereas in the Patent N o. 83,445 there is no line-space carried over the arched top of the boiler, and in Patent No. 47,968 there is no fluespace going up the sides of the boiler, though there is a series of tubes extending from the lower flue-space up through the Water-space of j n the boiler. Therefore n I claim as my invention as follows, viz:

The horizontal boiler A, arched at top andset forth, in combination with the fine-space' JOHN N. EAENHAM.

Witnesses R. H. EDDY, W. W. LUNT. 

